To reach the German targets to reduce CO2-emissions by 80 to 95% in relation to 1990 by 2050 an increase of installed capacity of renewable energy technologies, storages as well as technologies for power-to-X applications is well accepted in research in the field of energy system analysis. However current studies all result in different system compositions, which are due to many reasons. This meta-analysis assesses the bandwidth of technologies in the year 2050, needed for the above mentioned

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... 2-emission reduction, and compares the values to an extrapolation of current trend of the technologies. It is the goal to identify technology aspects, which need to be adapted to reach the goals as well as show trends in technologies, which are in line with the CO2-emission reduction targets. The results show, that higher emission reduction targets require an accelerated effort to decrease the primary energy demand. On technology side, wind energy, photovoltaics and biomass are mature technologies and show a tendency to reach the installed capacities to meet the emission reduction targets of 80%. Biomass energy and hydropower may not be expanded to a large extent, geothermal usage will either stay in a niche market or needs strong development. A strong increase of the heating technologies heat pumps and solar thermal until the year 2050 is unavoidable. Storages will be massively exploited, especially batteries in vehicles, stationary batteries and power-to-X storages, whereas pumped hydro storages exploitation is limited, due to available land and social acceptance.